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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a94a56cb1d8d1b5bc92506afa0c88ae3a8ee9ce99149b48f7274fc7b8328b584' 
  AND token = 'D1mO/VIvzJnGcLLSoTzv6enKRW49shi98uDkaPUgPu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}